Percentage Based ZigZag with trend colouring

A modification of the original ZigZag script, where the current price change in percentages are tracked, and the background is being marked based on trend strength. If a reversal is confirmed, the value of 2 or -2 is given, if its fading, meaning it is getting further from the highest high or lowest low by a treshold, 1 or -1 is given.
Colouring based on strength.